rudiment (n.)
- base
- basement
- basic
- basis
- bed
- bedding
- bedrock
- blastula
- bud
- egg
- element
- elements
- embryo
- fetus
- floor
- flooring
- footing
- foundation
- fundament
- fundamental
- fundamentals
- germ
- grammar
- ground
- grounds
- groundwork
- hardpan
- larva
- loins
- nucleus
- nymph
- ovum
- pavement
- principle
- principles
- radical
- seat
- seed
- sill
- spermatozoon
- substratum
- undercarriage
- understructure
- zygote